02-路由

//builder.MapRoute("default1", "{controller}/{action}/{id?}", new { controller = "Home", action = "index" });

                //builder.MapRoute("default2", "{controller=home}/{action=index}/{id?}", defaults:null);

                //builder.MapRoute("default3", "{controller=home}/{action=index}/{*id?}", defaults:null);//id/a/b/c全部匹配

                //builder.MapRoute("default4", "{controller=home}/{action=index}/{*id:regex(^\d{{2,3}}$)}", defaults: null);//正则表达式匹配2到3位的数字

                //builder.MapRoute("default5",
                //                 "{controller}/{action}/{id?}",
                //                 null,
                //                 constraints: new { action = "index|index2"
                //                                  , id = new IdScopeConstraint() }
                //                 );

                builder.MapRoute("default6",
                                 "{controller}/{action}/{id?}",
                                 null,
                                 constraints: new
                                 {
                                     action = "index|index2",
                                     id = new RangeRouteConstraint(10, 20)
                                     //  Microsoft.AspNetCore.Routing.Constraints.* 查找其他的内置
                                 }
                                 );

 RouteHandler customRouteHandler = new RouteHandler(async context =>
            {
                await context.Response.WriteAsync("custom routeHandler");
            });
            RouteBuilder routeBuilder = new RouteBuilder(app, customRouteHandler);
            ////参考文章：https://www.cnblogs.com/dotNETCoreSG/p/aspnetcore-3_4-routing.html

            //http://localhost:5000/home/test/3、http://localhost:5000/home/route/3 默认customRouteHandler
            routeBuilder.MapRoute("default route", "Home/{operation:regex(^route|test$)}/{id:int}");

            //http://localhost:5000/home/route1
            routeBuilder.MapRoute("Home/router1", async context =>
            {
                await context.Response.WriteAsync("router1 handler");
            });

            //http://localhost:5000/home/router2
            routeBuilder.MapRoute("Home/router2", async context =>
            {
                await context.Response.WriteAsync("router2 handler");
            });

            routeBuilder.MapRoute("files/{filename}.{ext:regex(^jpg|rar$)}", async context =>
            {
                await context.Response.WriteAsync("router3 handler,file:" + context.GetRouteValue("filename") + "." + context.GetRouteValue("ext"));
            });

            routeBuilder.MapRoute("download/{f}.{e:regex(^xls$)}", async context =>
            {
                await context.Response.WriteAsync("router4 handler,file:" + context.GetRouteValue("f") + "." + context.GetRouteValue("e"));
            });


            routeBuilder.MapRoute("download2/{filename}.{ext:regex(^xls$)}", context =>
          {
              RouteValueDictionary routeDataMap = new RouteValueDictionary
              {
                    { "filename",DateTime.Now.ToLongTimeString()},
                    { "ext","ecl"},
              };

              var vpc = new VirtualPathContext(context, null, routeDataMap);
              var path = routeBuilder.Build().GetVirtualPath(vpc).VirtualPath;
              return context.Response.WriteAsync("router5 handler,file:" + path);
          });

            app.UseRouter(routeBuilder.Build());

            app.Run(async context => await context.Response.WriteAsync("hello world"));